128221107 has 8 divisors (see below), whose sum is σ = 195384576. Its totient is φ = 73269192.

The previous prime is 128221103. The next prime is 128221109. The reversal of 128221107 is 701122821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128221107 - 2² = 128221103 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128221103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3052863 + ... + 3052904.

It is an arithmetic number, because the mean of its divisors is an integer number (24423072).

Almost surely, 2^128221107 is an apocalyptic number.

128221107 is a deficient number, since it is larger than the sum of its proper divisors (67163469).

128221107 is an equidigital number, since it uses as much as digits as its factorization.

128221107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6105777.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 128221107 is about 11323.4759239378. The cubic root of 128221107 is about 504.2584377836.

Adding to 128221107 its reverse (701122821), we get a palindrome (829343928).

The spelling of 128221107 in words is "one hundred twenty-eight million, two hundred twenty-one thousand, one hundred seven".